common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/net/bootp.c b/net/bootp.c
index 05bfede..d1e8cb8 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -13,6 +13,7 @@
 #include <command.h>
 #include <env.h>
 #include <efi_loader.h>
+#include <log.h>
 #include <net.h>
 #include <rand.h>
 #include <uuid.h>